Kindle conversion

Hi,

Would it be possible to add a "Convert to Mobi" button for Epubs / detect from the user agent that the browser is a kindle and serve up the mobi version? The actual conversion could be done on the fly by calibre-convert or kindlegen (command line tools that convert to mobi) so hopefully the actual addition to the program is not very intensive.

Reason for feature request is because kindle does not support epub (even when jailbroken) and does not allow to download epubs through the experimental browser on that device

Many thanks for your time and effort, I have found this application very useful!